Check recent, comparable sales
You can usually get a rough idea of the median price for similar properties by searching the property’s address on Domain or realestate.com.au. To get an even better idea, look at recent sales of similar properties. You’ll need to put some time in doing research to find truly comparable properties. Remember, not all two-bedroom houses are created equal, so pay attention to the condition, floor space, land space and amenities of the other sales in the area.
Track some properties that are listed for sale, and pay close attention to price guides prior to auction and the final selling price. You may notice a trend of properties selling well above the price guide. This makes it harder to come up with a pre-auction offer because sellers will expect a competitive auction result.
You may notice a property is up for auction but doesn't sell (it might be listed as "passed in" in an auction results summary online). This may be a sign that the seller is adjusting expectations and could be open to a reasonable pre-auction offer.